\begin{tabular}{l*{11}{c}}
\hline
                 &\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}\\         &\multicolumn{1}{c}{4}&\multicolumn{1}{c}{5}&\multicolumn{1}{c}{6}&\multicolumn{1}{c}{7}&\multicolumn{1}{c}{8}&\multicolumn{1}{c}{9}&\multicolumn{1}{c}{10}&\multicolumn{1}{c}{11}&\multicolumn{1}{c}{12}&\multicolumn{1}{c}{13}&\multicolumn{1}{c}{14}\\ \hline  \emph{Second stage}\\
Enrollment  &      -0.076   &      -0.099   &      -0.098   &      -0.081   &      -0.095   &      -0.121*  &      -0.138** &      -0.121*  &      -0.122*  &      -0.055   &      -0.099*  \\
            &     (0.066)   &     (0.063)   &     (0.066)   &     (0.066)   &     (0.065)   &     (0.063)   &     (0.063)   &     (0.062)   &     (0.062)   &     (0.057)   &     (0.056)   \\
\hline
Controls    &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   \\
F-stat      &         221   &         230   &         235   &         231   &         230   &         233   &         225   &         224   &         227   &         233   &         235   \\
N           &        3637   &        3634   &        3619   &        3599   &        3573   &        3552   &        3521   &        3497   &        3452   &        3403   &        3370   \\
Mean of Y   &        0.56   &        0.60   &        0.63   &        0.66   &        0.68   &        0.70   &        0.71   &        0.71   &        0.72   &        0.74   &        0.75   \\
\hline
\end{tabular}
